Users report data compatibility problems where importing content destroyed their history with tags losing their names entirely. Migration into Mem can result in data loss and corrupted organization, making it risky to commit fully.

Users report that bugs reported 2.5 years ago with the note-taking experience have still not been fixed. Despite being a core product issue, basic functionality problems persist for years. This indicates a concerning lack of development resources or priorities.

Mem AI relies on an internet connection for real-time AI processing and synchronization. While basic note input works offline, AI-dependent features are unavailable without connectivity, limiting mobile use.

Specific persistent bugs include: numbered lists add a space when copy-pasting, code blocks require extra space after closing or text becomes part of the code block, and bullets/numbered lists break after adding non-bulleted elements. Basic editing is frustrating.

Search functionality fails to identify tags, making information retrieval problematic. For a tool built on the promise of 'finding things automatically,' broken search makes it untrustworthy as a personal knowledge management system.

In the transition from Mem 1.0 to 2.0, inbox and task management features were removed, now only available as views. Users who relied on these features were forced to find alternatives or change workflows.

The folderless approach can be a difficult adjustment for users accustomed to traditional organization. While marketed as freeing, many users find it disorienting and miss the ability to manually structure their notes.

Users report extremely poor customer service, especially from the co-founders. Complaints that they don't respond to emails, with issues going unacknowledged for extended periods. For a small startup, this lack of responsiveness is particularly damaging.

There is no official Android app, which is a major drawback for many users. Android users are completely excluded from mobile access, limiting Mem to iOS and desktop users only. In 2026, this is a significant limitation.

The mobile experience has gone from 'unusable to barely tolerable' according to users. Even on iOS where an app exists, the experience is frustrating. Syncing issues across devices compound the problem.

The platform can feel sluggish or slow at times, impacting the note-taking experience. For a tool meant to capture thoughts quickly, lag disrupts the workflow and makes real-time capture frustrating.

Mem had a competitive advantage when AI first launched but lost it when the OpenAI API became available. Other note-taking apps like Capacities, Kortex, and Tana were able to leapfrog Mem with similar AI features.

There's a massive lack of API integrations according to user complaints. Key integrations like Readwise are missing, and no rich snippets support exists. Users wanting to connect Mem into existing workflows face significant limitations.