
Claude Code
Cursor
Google Antigravity
warp by spolu
GitHub Copilot
Codex 3.0 by OpenAI
Zed
The AI coding agent, built for the terminal.

energycalculator.blog
WattSized
CampPowerCalc
EcoEnergyCalc
CHEA NEM12 CSV Microtools
HelioScope
Solargraf
Free, accurate calculators for home energy savings — solar payback, heat pumps, EV charging, appliance running costs and more. No signup.

Which is more popular?
Based on our record, opencode seems to be more popular. It has been mentioned 73 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | opencode.ai | howmuchwatts.com |
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What each product offers, as listed by its team.


No features have been listed yet.
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
OpenCode: FASTEST AI Coder + Opensource! BYE Gemini CLI & ClaudeCode!
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing opencode and HowMuchWatts.
HowMuchWatts's answer:
HowMuchWatts is a free suite of 50+ home energy calculators - no signup, no ads gating the result. Every calculator shows its formula and updates live as you type, so you can see exactly how the number was reached rather than trusting a black box. It also includes an appliance power-consumption reference chart and plain-English guides (solar payback, heat pump vs gas, EV charging costs) that pair with the calculators instead of just linking out.
HowMuchWatts's answer:
Most energy calculators are either buried in signup walls, ad-heavy, or give a single number with no way to check the math. HowMuchWatts is: - Free, no account needed - Transparent - the formula is shown alongside every result - Focused - 50+ calculators covering solar, heat pumps, EVs, and appliances specifically, not a generic all-purpose calculator site - Embeddable - any blog can drop a calculator into a post for free
HowMuchWatts's answer:
Homeowners and renters trying to make a specific energy decision - is solar worth it, should I switch to a heat pump, what will an EV cost to charge, what is this appliance actually costing me. Secondary audience: bloggers and content sites in the home/energy space who embed the calculators in their own articles.
HowMuchWatts's answer:
Built out of frustration with existing energy calculators - they were either oversimplified, buried behind email walls, or impossible to verify. HowMuchWatts started as a handful of calculators that show their formula and grew into a 50+ calculator suite covering solar, heat pumps, EVs, and everyday appliances, plus guides and a reference chart for the underlying data.
Share your experience with using opencode and HowMuchWatts. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


You can check out Muse Spark 1.3 by using OpenCode (https://opencode.ai/ - open-source AI / coding harness). There's a terminal version and a GUI / desktop version. Good luck! - Source: Hacker News / 11 days ago
[OpenCode IDE](https://opencode.ai/) (for the indexing part). - Source: Hacker News / 16 days ago
What the person above is suggesting: * https://pi.dev/ * https://omp.sh/ Personally I also think that OpenCode is nice, their CLI version is enjoyable and their desktop/web version is mostly okay: * https://opencode.ai/. - Source: Hacker News / about 1 month ago
Tracking HowMuchWatts since Jul 2026.
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