Assumer vs Aider
An honest, side-by-side look at Assumer and Aider by Aider-AI (open-source project): where each one runs, which models it uses, how it handles tools and permissions, and what it costs.
Last checked October 2026. Facts about Aider come from its official docs and pricing pages, linked below.
At a glance
| Feature | Assumer | Aider |
|---|---|---|
| Made by | 4Born Solutions | Aider-AI (open-source project) |
| Where it runs | Terminal, Desktop app, Web | Terminal |
| Open source | Built on OpenCode (MIT) | Yes (Apache-2.0) |
| Models | Models run through the Assumer service; sign-in required (assumer login, device flow). |
Connects to almost any LLM (Claude, DeepSeek, OpenAI and others) with your own API keys, including local models. |
| Bring your own API key | No | Yes |
| Local models | No | Yes |
| MCP support | Yes | No |
| Plan mode | Yes | Partial |
| Subagents | Yes | Not verified |
| Rules file | Assumer.md (AGENTS.md and CLAUDE.md compatible) | CONVENTIONS.md (loaded with --read or .aider.conf.yml) |
| Windows | Yes | Yes |
| Pricing | Free; paid from $20/mo | Free |
Where each one shines
Choose Assumer if you want
- Spec-driven development built in: constitution, specify, plan, tasks, implement.
- Meetings: turns a meeting transcript into a development plan.
-
Many surfaces from one install: terminal TUI/CLI, headless server (
assumer serve), web UI (assumer web), ACP for editors such as Zed, plus a desktop app.
Choose Aider if you want
- Free, Apache-2.0 licensed, and works with nearly any model, including local ones.
- Repository map helps it work in larger codebases.
- Works from any editor by acting on code comments; ask and architect chat modes.
Trade-offs to know
Assumer
- Requires sign-in; models run through the Assumer service rather than your own provider keys.
- Desktop downloads, the curl installer and Homebrew are coming soon; install today is via npm.
Aider
- Terminal only; no first-party desktop app or IDE extension.
- No native MCP support at check time (open feature request; third-party bridges exist).
Pricing
Assumer
Free
Placeholder pricing
$0
Pro
Placeholder pricing
$20/mo
Max
Placeholder pricing
$100/mo
Team
Placeholder pricing
$40/user/mo
Enterprise
Placeholder pricing
Custom
Aider
Open source
You pay your model provider directly
$0
Frequently asked questions
Is Assumer a good alternative to Aider?
Yes, if you want an AI coding agent for the terminal and desktop with plan and build agents, MCP servers, granular permissions, spec-driven development and meeting-to-plan workflows. If the Aider strengths listed on this page matter most to your team, Aider may be the better fit.
How much do Assumer and Aider cost?
Assumer: Free; paid from $20/mo. Aider: Free. Prices change often, so check each pricing page before you buy.
Can I use my AGENTS.md rules with Assumer?
Yes. Assumer reads Assumer.md rules files and is compatible with AGENTS.md and CLAUDE.md. Aider uses CONVENTIONS.md (loaded with --read or .aider.conf.yml).
Do Assumer and Aider support MCP?
Assumer supports local and remote MCP servers. Aider: no.
Try Assumer alongside Aider
Install the CLI in one command and run it on a real task in your own repository.
npm i -g @4born-solutions/assumer