SumizAI vs NoteSR

What NoteSR is

What NoteSR is

NoteSR is a secure, offline-first Android note-taking app built by a team from Ukraine that creates an encrypted storage space on the user's device for more than just text — for any type of file. All content — text notes and attached files alike — is fully encrypted with AES-256, a recognized encryption standard also used by financial institutions and government agencies.

Key features

AES-256 encryption covers both note text and any attached files — photos, documents, recordings — which sets NoteSR apart from many notes apps that encrypt only the text itself while treating attachments as a separate, less-protected category of data. Being able to open attached files directly inside the app, without decrypting and saving them to disk in plain form first, meaningfully reduces the risk of accidental data leakage through temporary files the operating system creates. The offline-first approach means the app works fully without an internet connection — there's no requirement to log into an external server to save or read a note. Open source code under the MIT license lets anyone independently verify the claimed encryption actually works as described.

Who it's for

NoteSR appeals to Android users who want to store not just text notes but also sensitive files — scanned documents, photos, voice recordings — in one fully encrypted place, instead of scattering them across the photo gallery, file storage, and a separate notes app. People who value working fully offline, without dependence on a cloud account or a constant internet connection, will find a natural fit here.

Use cases

In practice, NoteSR works well for storing scanned ID documents or contracts that only the phone's owner should be able to access, encrypted with the same mechanism as the rest of the notes. A traveler can keep photos of important travel documents in NoteSR's encrypted space, accessible even without internet coverage somewhere remote. Someone keeping a private journal with attached photos can be confident all the content — both text and images — is protected under the same level of encryption.

Pricing and business model

NoteSR is entirely free and open source under the MIT license, with no premium tier and no ads.

Limitations and what to watch for

Being Android-only excludes iOS and desktop users entirely. The lack of cloud sync stemming from the offline-first philosophy means losing or damaging the phone without a separate backup could mean permanently losing all encrypted notes and files — it's worth setting up your own regular backup routine for the encrypted store. As a lesser-known, niche project, NoteSR also has a smaller user community and less frequent updates than more recognized apps in this category.

AI notes and files in one encrypted place

NoteSR has no built-in AI model integration, but thanks to the ability to attach any file, a user can save an ai notes entry from an assistant conversation as a plain text file attached to an encrypted note, benefiting from the same AES-256 protection as the rest of the content. For people combining sensitive documents with text notes, such an ai notes entry simply becomes another element of the same, consistently protected archive.

What's worth checking before choosing

Before making NoteSR your primary place for sensitive data, work out your own routine for regularly backing up the encrypted store, since the app offers no automatic cloud sync, and losing the phone without a backup means losing the data.

Bottom line

NoteSR is a niche but solid app combining encrypted text notes with encrypted storage of any file in one place on Android. Anyone who wants ai notes from AI conversations to land in such an archive automatically without manually attaching a file should consider a tool built around that workflow.

Offline philosophy as a deliberate choice

At a time when most new notes apps default to cloud sync as the primary way of working, NoteSR goes the other direction, treating independence from an external server as an advantage rather than a limitation to accept. For the user, that means their data never leaves the device in a form that could be intercepted in transit — the whole threat model around data-in-transit security simply doesn't apply here, because there's no data transit between the device and a server at all.

A small but active project

Although NoteSR doesn't yet have wide recognition on AlternativeTo, the very fact that a smaller development team chose to implement full AES-256 encryption for both text and arbitrary files — a feature many far larger and more popular notes apps still lack — points to security being prioritized from the earliest architectural decisions, rather than bolted on later under user pressure.

Trust through simplicity

Smaller projects like NoteSR have one practical advantage over sprawling corporate apps — a smaller codebase is easier to fully understand and verify, even by a single developer, without needing to review millions of lines of code from a large platform. For users especially sensitive about security, that transparency can matter more than a long list of extra features they would never use anyway, each one a potential new, unproven surface for bugs.

A daily backup discipline

Since NoteSR doesn't do this automatically, it's worth building a habit of periodically exporting the encrypted store to a separate medium, say once a month — much like with any ai notes pasted in there manually, full responsibility for its survival in the event of phone failure rests entirely with the user, not with an automatic cloud mechanism that simply doesn't exist here.

Comparison with SumizAI

NoteSR and SumizAI share a concern for data security, but differ in scope and platform. NoteSR is a local, encrypted box for text and files, Android-only and working offline. SumizAI generates ai notes directly from a conversation with an AI model — answers worth keeping land automatically as Markdown files in a vault the user owns, accessible across multiple platforms. Anyone who needs an encrypted store for sensitive files on their phone will pick NoteSR; anyone who wants ai notes from AI conversations to be created automatically and available across platforms will find SumizAI the better-fitting tool.

What SumizAI is

A note-taking application built around a conversation with an AI model. You ask a question, the answer streams back, and the answers worth keeping become Markdown notes — filed into a vault that is a folder on your own disk.

A vault is a directory holding base.md, a generated table of contents up to six levels deep, and a notes/ folder with one .md file per note. Before a note is written it is checked against the ones already there, so the fourth note about the same idea gets merged instead of added. Links between notes are ordinary Markdown links to files that exist.

The model is never ours: you bring your own API key to one of seven providers — Anthropic, OpenAI, Gemini, Groq, OpenRouter, a local Ollama or your own server — and pay that provider directly. A question sends the table of contents plus at most five relevant notes within a 24,000-character budget, and the app shows you which five it used.

Every answer kept this way becomes one of these ai notes, ready to search again months later without hunting back through old chats.

Side by side

Where they differ

• AlternativeTo's description of NoteSR does not mention an AI model. That is the whole starting point in SumizAI: you have a conversation with a model on your own API key, and the answers worth keeping become notes without you filing them.
• NoteSR is open source (MIT), and SumizAI is not. If reading the source is what decides it for you, that is a real argument for NoteSR. The guarantee SumizAI offers instead is structural rather than legal: the notes are Markdown files in a folder you chose, so they open in any editor whether or not the application is running.
• AlternativeTo's description of NoteSR does not mention Markdown, so check what format your notes end up in before you fill it up. SumizAI writes standard .md files to a folder you picked, and an unpaid account can still export all of them.
• NoteSR advertises encryption. SumizAI answers the same worry a different way: on the desktop the notes never leave your disk, and the material a question sends to the model is capped at the table of contents plus at most five notes — and the app shows you which five it used.

Which one to pick