Concise monthly summary for February 2026 across deltachat-ios, chatmail/core, and deltachat-android, focusing on business value and technical achievements.

January 2026 (2026-01) monthly development summary for deltachat across Android, iOS, Desktop, and chatmail/core. Focused on delivering business value through localization expansion, UI/UX improvements, privacy enhancements, and release readiness. Across the month, cross‑platform work delivered Kabyl (Taqbaylit) translations, file-name display improvements (middle truncation), privacy-friendly profile and chat summaries, encryption messaging clarity, and a structured release process culminating in version 2.37.0 with updated changelog and documentation. Additional maintenance included UI polish, accessibility enhancements, and targeted refactors (pref_chats, deprecated code cleanup) to reduce technical debt and improve maintainability. Overall impact: easier onboarding for users in more languages, clearer and safer user interactions, and a solid foundation for future features.

December 2025 — Focused on cross‑platform release readiness, localization, privacy, and maintainability with substantial foundation work for transport/relay management and core Rust integration. Coordinated release prep and version bumps across multiple target releases (v2.29.0, v2.32.0, v2.33.0, v2.34.0, and v2.35.0), upgrades to deltachat-core-rust, and Rust toolchain improvements. Delivered extensive localization/local help updates, updated changelogs, and documentation across iOS, Android, Desktop, and core. Implemented Transport management groundwork (UI components, default transport support, editing UX, and background transport addition with progress), reinforced UI/UX consistency and terminology modernization, and strengthened privacy with device owner verification and enhanced onboarding messaging. Demonstrated breadth of technologies and practices including cross‑platform release engineering, FFI transport event support, code quality refactoring, and maintainability improvements.

November 2025 monthly summary for deltachatAndroid and deltachatDesktop focusing on delivered features and maintainability improvements across Android and Desktop. Highlights include a state-management simplification on Android by removing a persistent option, and a UI clarity improvement on Desktop by renaming a Save action to Save Message with updated tests. These changes reduce configuration surface, clarify user workflows, and improve cross-platform consistency and test coverage.

October 2025 performance snapshot across chatmail/core, deltachat-android, deltachat-ios, and deltachat-desktop focused on delivering developer-friendly improvements, UX enhancements, and streamlined release processes. Key outcomes include: (1) DeltaChat FFI API Documentation and Strings Enhancements to clarify call-related events and expand string definitions for status messages and channel notifications; (2) robustness improvements for unknown viewtypes in message processing to prevent errors and data loss; (3) Android UX improvements with localization-friendly text for messaging and channels, plus migration work removing legacy features to simplify onboarding and maintenance; (4) iOS release management and versioning readiness with multi-version bumps (2.18.0–2.22.0, targeting 2.22.1), translation updates, UI adjustments, and improved help content; (5) desktop cleanup reducing localization overhead by removing unused stock strings. These changes improve reliability, accelerate feature releases, and strengthen internationalization and maintainability.

Performance summary for 2025-09: Across deltachat-android, chatmail/core, and deltachat-ios, delivered refactor readiness, UX improvements, and policy updates that reduce technical debt, strengthen reliability, and enable faster future iterations. Key outcomes include cross-repo deprecation of legacy string constants to pave the way for a unified refactor; an updated outdated version warning policy with complementary test adjustments; unified call UI and enhanced call state tracking to improve user experience and analytics; iOS-focused improvements to notification/status visibility and settings awareness; and a new disappearing messages option up to one year with related UI/translations updates. In the absence of reported critical bugs, emphasis remained on stability improvements and platform-wide consistency.

In August 2025, DeltaChat delivered cross‑platform UX improvements, feature enhancements, and release‑readiness work across iOS, Android, and core Rust, with a stronger focus on business value, localization, and privacy. Key outcomes include UI polish, email chat cloning capabilities, and proactive release maintenance that accelerates onboarding of new users and reduces time-to-market for new releases.

July 2025 cross-repo delivery focused on user experience, localization, security messaging, and release readiness across Android, iOS, Desktop, and the core Rust stack. Highlights include major UI/UX improvements, improved media handling, stronger E2EE messaging cues, and proactive release prep. Deliverables span enhancements to profile and chat experiences, broader localization updates, and business-facing features such as a donation device message. Release engineering and core updates were advanced in parallel to position the project for stable 2.x milestones.

June 2025 monthly summary focusing on cross-platform feature delivery, privacy improvements, and API evolution across iOS, Android, and Desktop. Key business value came from improved user experience, streamlined onboarding, stronger privacy safeguards, and coordinated release readiness.

May 2025 performance summary for deltachat studios. Across deltachat-android, deltachat-ios, and chatmail/core, the team delivered tangible stability, UX upgrades, localization coverage, and release readiness. The month focused on reducing crash risk, speeding up startup and profile loading, and enabling richer media interactions, while also cleaning the codebase and preparing releases across platforms. Key features delivered by repo: - deltachat-android • JSONRPC Stability and Error Handling: fixed crash in JSONRPC due to null responses; broadened exception handling to improve resilience; commits bc72fce060d6c8423e2cbbb278227dfd97983f62 and 17e45fd2ab60f8d9eab087040d56a36d770976d4. • Startup Crash Potential Fix: addressed potential startup crash to improve startup reliability; commit 8f2b761361e2e90be5c35f1f9996c8bfb36dbd94. • User Interface Text Improvements and Localization: UI text refinements, hints, localization updates, translations and iOS text resources; multiple commits (e.g., 5587eda6573e3cc9154d9f115c306c820994b7bb; a7b86dd59a8f5acfdf5d3da82aaca26651928fd9; e6655fa21d58dce4638c51167e2bb63b42302249; 93c52ec5278f303c57f9efca31e4d61b1ccfd0c0; 04ed9e27c130ee787dd4d332a189eff4405089d1; 27875b83bc32a978b5c1a36a2733286f4dab3d80; cdc47423f9bcb303e719d0d8e8d0a0679eac87cf; 6cc9a2594f3be136f851c0d90e7afef3da4ce1ab). • Code Cleanup and Documentation Hygiene: repository hygiene, removal of deprecated strings and metadata cleanup; commits 9790730d7517905907e26bfbda39466982c0a1d5; 201f6e46b005bfa2fc98ad0c80465d74d4914d11; bb410a1bb109417e3db68ebbbb1bc175e42305f4; 29d04afc516f2a03b903e7c7938b87879af90616. - deltachat-ios • Media handling improvements: enable sending multiple images and optimize video quality/size; commits 9dea5b5f7738ec912809436b090845fd69983f2e and c91433a71cd121088b5d6fea3ed0218c5e08add3. • Localization updates: update translations for latest strings/locales; commit 5e1b2243e522792486df6b2eecb2b02efa970eb9. • Chat and profile architecture refactor and code quality: unifying profiles, initialization simplifications, profile-new architecture, and code quality improvements; numerous commits (e.g., 61916db2e88bd10a027a056843d001c643809762; a31b674db303257eb96ea595b84e6594154683c4; 14905244ca91de98da17e0fe19de3e2986605b94; 0df4357cc16ab86c426a38ed3199e52cbcfa1c76; 5dd1016e38770f589e9f5437eba1d0b30a09d7bb; d8b82ed3bff44865cb3961df9cd0d26fba41a109; 9c452bfd1baa0e06ebb62d42fb1e85cd5aa96147; efeace15ddb329bb52df49bc764720e3bd71acf6; 6c6c9a871b0cc06c7ef319d34a6e660b30ae917f; fd77bcfc13768925cdf05a7a02f8640ef51ae638; 88d714c29cc8c7c8edb8883b2cc9d7a0c0c532fc). • Start chat and share contact features; commit 11101f6ef87833bf0521256adc979681e814f893. • Shared chats support: show/shared chats and updates on messages; commits d33dfc63ebf738ad373c1ddb678a1868e7c718d7; 715f6c27cb84c1d5bf79f0b2b4273d0f59eec514; 17ad2e1f287a62c1f0596f8907bcdd0b450cbecb. • User profile and presence enhancements: encryption info, block contact, bio, last seen; commits 865c273d1ab2435606d1e5b52acc59eecc64c7fb; fd6862745c2c95e0f6906fc8a8d1035ad551ee6a; abe56870c7fe465f83111e4d49b7cf8d5bc3d35a. • UI title accuracy fix; commit a86e67b67e91506f6236b0b0558ad6dad7b64194. • Attach original images and files directly; commit 9becfa916489040b8fee4a8385fa1579f8fe5774. • Release and versioning housekeeping; commits updating deltachat-core-rust and version bumps to 1.159.3, 1.58.3, etc.; and release notes/doc updates. • Documentation and release notes updates, translations updated, verifiedBy flag, ProfileViewController rename and usage, profile UI improvements, naming consistency, code cleanup/refactoring, and safety/evaluation improvements across code paths; numerous commits listed in the input. - chatmail/core • Webxdc Apps: sort chat media by last update time; commit a24e6e4278e1c8b4e4c3d764b2be43eb419fc7a3. Overall impact and accomplishments: - Reduced crash surface and improved startup reliability across Android and iOS, enhancing onboarding and stability. - Substantial UX and localization improvements, enabling better accessibility and broader language coverage. - Faster profile loading and more robust chat loading with architecture refactors and performance optimizations. - Release readiness established with coordinated versioning, changelogs, and core Rust updates, reducing risk for upcoming releases. Technologies/skills demonstrated: - Android/Kotlin and iOS/Swift development, including UI/UX refinements, localization, and media handling. - Cross-repo architectural refactors, code cleanup, and testing enhancements, with attention to maintainability and readability. - Localization pipelines, translation updates, and local help/resources. - Release engineering, including changelog discipline, versioning, and Rust core integration.

In April 2025, delivered a coordinated, cross‑platform set of improvements across Android, iOS, desktop, and the core chat stack. Focus areas included localization and copy modernization, UI/UX polish, security hardening, and release readiness, driving clearer user communication, stronger privacy guarantees, and faster time-to-market for new releases. Notable work spanned four repositories and emphasized business value, user clarity, and maintainability. Key features delivered: - deltachat/deltachat-android: translations and copy updates across the app, UI/UX tweaks (e.g., hiding classic email option for chatmail, terminology cleanup), stock translations maintenance, and script enhancements for string extraction in chatmail dirs. - chatmail/core: SecureJoin UX improvements and timeout handling to prevent unencrypted messages, JSON-RPC API enhancements (info_contact_id), UI/UX refinements for second device setup and avatars, privacy and encryption improvements for messages, ASM handling refactor, and progress feedback improvements for unsupported operations; branding rename from Delta Chat to Chatmail. - deltachat/deltachat-ios: UI icon standardization, full-screen avatar display, iOS UI components updates for reactions/contacts/account switching/proxy sharing, and bug fixes (removing misleading strings, chat UI tweaks) plus localization and changelog updates. - deltachat/deltachat-desktop: codebase cleanup removing unused stock translations, removal of redundant broadcast encryption warning, hiding user address in primary settings, reordering attachment menu with improved UX, changelog updates, and release-management activities. Major bugs fixed: - Fixed selfName behavior when displayName is not set (Android). - Progress indicator reset to 0 and specific error on unsupported operations (core). - Removed misleading string usage related to App/webxdc in the UI (iOS/Android). - Chat UI behavior tweaks including hiding the classic email option for chatmail and layout adjustments. - UI stability improvements: hiding emails in the primary profile UI and preserving state across app switches. Overall impact and accomplishments: - Improved localization coverage and accuracy across Android, iOS, and desktop, reducing user confusion and support load. - Strengthened security UX for SecureJoin flows and message encryption, with clearer user feedback during long-running operations. - Branding alignment with a unified Chatmail experience across all platforms and updated documentation. - Prepared for release with coordinated core Rust updates, version bumps, changelog and local help updates, and cross-repo quality enhancements. Technologies/skills demonstrated: - Cross‑platform development and coordination (Android, iOS, Desktop) across multiple teams. - Localization pipelines, stock string maintenance, and help content updates. - UI/UX design and accessibility improvements, including icon standardization and full-screen avatar. - Security hardening and privacy improvements (SecureJoin, encrypted broadcasts). - API design and documentation (JSON‑RPC for info_contact_id, Chat-Edit/Delete adjustments). - Release management, including core Rust upgrades and versioning, changelog discipline, and local help updates.

March 2025 performance summary across deltachat-desktop, deltachat-android, deltachat-ios, and chatmail/core focused on cross‑platform UX polish, feature expansion, localization, and release‑readiness. Delivered a coherent set of UI/UX improvements, platform‑specific enhancements, and codebase hygiene that reduce user friction, boost engagement, and streamline maintenance. Highlights include cross‑repo UX refinements, improved chat deletion UX, added mute option variability, stronger changelog governance, and enhanced saved messages and encryption visibility for clearer user identity and data handling across clients.

February 2025 performance summary focusing on key features, major fixes, cross-platform delivery, and added business value across deltachat-ios, deltachat-android, deltachat-desktop, and chatmail/core. Highlights include a comprehensive UI/UX refresh on iOS, enhanced sharing and saved messages workflows, broad localization and release readiness, stability fixes for share extensions and backup compatibility, and cross-device security improvements that strengthen audience trust and deployment readiness across platforms.

January 2025 monthly performance: Cross‑platform localization hardening, UI modernization, and release readiness across Android, iOS, and desktop, with Saved Messages feature introduced in chatmail/core. Emphasis on business value: expanded locale coverage, clearer UX for critical actions (QR code, widget tooling), and accelerated release cycles through disciplined changelog, dependency, and version management.

December 2024 monthly summary: Delivered key features, reliability improvements, and release readiness across chatmail/core, deltachat-android, and deltachat-ios. Highlights include documentation enhancements for CFFI/JSON-RPC; Android UI polish and privacy improvements; Webxdc startup reliability fix; multiple release and versioning activities on iOS; and ongoing dependency updates and code cleanup that reduce maintenance burden. The work emphasizes business value through clearer developer docs, improved user privacy and onboarding, more reliable app startup, localization improvements, and streamlined release processes.

Concise monthly summary for 2024-11 across deltachat Android, iOS, Desktop, and core chat components. Focused on stabilizing user onboarding, improving release processes, and expanding notification and privacy capabilities. Delivered measurable improvements in app stability, UX performance, and go-to-market readiness, while maintaining cross-platform consistency and future-proofing through updated dependencies and tests.

Cross-platform notification and UX enhancements, performance optimizations, and release engineering completed in Oct 2024. Key features delivered include iOS real-time reaction notifications, improved sender name accuracy, and clearer notification summaries; Android adds reaction notifications, ticker context, and reduced database calls; in-chat sound playback is now context-aware; and core release prep for 1.148.6 with updated changelogs and versioning.

February 2024: Delivered a focused UI enhancement in deltachat-ios to display avatars for non-self messages in self-chat, improving clarity of message origins and readability of forwarded content. The change was implemented in commit 77eeeb3b736bbb7788fb2120331301f3af8236d0. No major bugs fixed this month; the work centers on UX improvement and code quality, delivering measurable business value by reducing user confusion and potential support inquiries. Skills demonstrated include iOS app development, UI/UX design, Git-based workflow, and cross-functional collaboration.