Assumer vs Google Antigravity
An honest, side-by-side look at Assumer and Google Antigravity by Google: where each one runs, which models it uses, how it handles tools and permissions, and what it costs.
Last checked October 2026. Facts about Google Antigravity come from its official docs and pricing pages, linked below.
At a glance
| Feature | Assumer | Google Antigravity |
|---|---|---|
| Made by | 4Born Solutions | |
| Where it runs | Terminal, Desktop app, Web | Desktop app, Terminal, IDE |
| Open source | Built on OpenCode (MIT) | No (proprietary) |
| Models | Models run through the Assumer service; sign-in required (assumer login, device flow). |
Multi-vendor: Google Gemini models, Anthropic Claude models and GPT-OSS 120B (availability varies by plan). |
| Bring your own API key | No | No |
| Local models | No | Not verified |
| MCP support | Yes | Yes |
| Plan mode | Yes | Yes |
| Subagents | Yes | Yes |
| Rules file | Assumer.md (AGENTS.md and CLAUDE.md compatible) | AGENTS.md or GEMINI.md (also .agents/rules/*.md) |
| Windows | Yes | Yes |
| Pricing | Free; paid from $20/mo | Free; paid from $19.99/mo |
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 Google Antigravity if you want
- Choice of Gemini and Claude models from a single tool.
- Several surfaces: desktop app with worktree-isolated agents, a terminal CLI, an IDE and browser control.
- Free individual tier with unlimited tab completions.
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.
Google Antigravity
- Free-tier and paid limits are capacity-based and have changed over time.
- Paid usage is tied to Google AI subscriptions rather than a standalone Antigravity plan.
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
Google Antigravity
Individuals
Basic weekly limits
$0
Google AI Pro
Larger allowance and flexible credits (price from third-party source)
$19.99/mo
Google AI Ultra (5x)
5x Pro usage limit in Antigravity
$100/mo
Google AI Ultra (20x)
20x Pro usage limit
$199.99/mo
Business (Google Cloud)
Or pay-as-you-go with no seat fee
From $30/seat/mo
Frequently asked questions
Is Assumer a good alternative to Google Antigravity?
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 Google Antigravity strengths listed on this page matter most to your team, Google Antigravity may be the better fit.
How much do Assumer and Google Antigravity cost?
Assumer: Free; paid from $20/mo. Google Antigravity: Free; paid from $19.99/mo. 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. Google Antigravity uses AGENTS.md or GEMINI.md (also .agents/rules/*.md).
Do Assumer and Google Antigravity support MCP?
Assumer supports local and remote MCP servers. Google Antigravity: yes.
Sources
- https://antigravity.google/pricing
- https://antigravity.google/docs/getting-started
- https://antigravity.google/docs/models
- https://antigravity.google/docs/rules
- https://blog.google/products-and-platforms/products/google-one/google-ai-subscriptions
- https://www.cloudzero.com/blog/google-antigravity-pricing/
Try Assumer alongside Google Antigravity
Install the CLI in one command and run it on a real task in your own repository.
npm i -g @4born-solutions/assumer