BasicATTCalc vs ClawOS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BasicATTCalc
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Basic Attenuator Calculator (BasicATTCalc) helps you calculate various resistive attenuators which are used in many audio, video and RF circuit design applications. The standard resistance values based on E-series numbers are outputted in inputting necessary conditions such as source impedance, load impedance and attenuation. Features The calculable attenuators and impedance converters are as follows: - Type T - Type Pi (π) - Type H - Type O - Type Bridged T - Type Bridged H - Type L (Impedance converter) - Type U (Impedance converter) Calculated resistance values are displayed with ideal values or the following E-series number specified either. E12, E24, E48, E96, E192 The most suitable values are calculated in selecting priority calculation whether Simple or Precision. - Simple: Perform calculations that the nearest values are derived to desired impedances and attenuation by the simple structure - Precision: Perform calculations that the nearest values are derived to desired impedances and attenuation by consisting of up to 4 resistors per an element In addition to resistance values, this application provides you with input impedance, output impedance and calculated attenuation with mismatch loss. If necessary, it is able to calculate power dissipated by each resistor and parameters such as reflection coefficient, VSWR, return loss and mismatch loss. Attention Because the standard resistors are used, the following restriction is set up. - Range of resistance value: 1Ω ~ 10MΩ (except ideal values)
ClawOS
This app provides a private AI assistant running in your own dedicated cloud container, ensuring your data and conversations remain secure and unshared. It offers a free tier with limited messages and a premium subscription for unlimited access, file storage, and extensive integrations.
- Dedicated private cloud container
- 20 free AI messages daily
- Personalized daily briefing
- Unlimited conversations (subscription)
- Private workspace with file storage
- 100+ integrations
- Custom alerts and scheduled tasks
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ClawOS is OpenClaw, fully managed — your own AI agent in the cloud that runs automations across the apps you already use. No terminal, no servers, no setup. POWERED BY OPENCLAW ClawOS gives you a private, dedicated OpenClaw instance — the open-source AI gateway (MIT license) trusted by the self-hosting community — without any of the setup or maintenance. You get all the power; we run the infrastructure. SMART ROUTINES THAT RUN THEMSELVES Set it once and it runs on a schedule, in the background: • Morning Briefing — weather, your calendar, and overnight news before you wake • Inbox Triage — overnight email sorted, replies drafted, junk archived • Standup Prep — your GitHub activity turned into three clean talking points • Revenue Pulse — your Stripe numbers explained in plain English • Topic Watch — the threads worth your time, digested Briefings land right in your chat. You only hear from it when it matters. 100+ INTEGRATIONS, ONE AGENT Connect Gmail, Google Calendar, Slack, Notion, GitHub, Linear, Stripe, Strava and 100+ more. Your agent works across all of them from a single conversation. WORKS IN YOUR MESSAGING APPS Talk to your agent in Telegram and more — it can even join your group chats. FREE TO TRY Start free with Gemini 2.5 Flash-Lite — 10 messages per day, no credit card required. Get a daily briefing delivered to your chat. YOUR PRIVATE WORKSPACE Every subscriber gets a dedicated cloud instance — not a shared pool. Your files, conversations, and automations stay private and persistent. SUBSCRIPTION • Monthly subscription: $29.99/month • Free tier available with no credit card required • Auto-renews monthly. Cancel anytime in Settings or the App Store. • Payment charged to Apple ID at confirmation of purchase Privacy Policy: https://spark.ooo/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms of Service: https://spark.ooo/terms
Screenshots
Verdict
The clearest difference is price: ClawOS at Free against BasicATTCalc's $1.99. ClawOS also leads on update cadence (every 10 days vs every 29 months). BasicATTCalc's advantage is in-app purchases (none vs 5) and device support (3 vs 1). On ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
ClawOS is free to download; BasicATTCalc costs $1.99 up front. ClawOS sells 5 in-app purchases, starting at $29.99 per month. BasicATTCalc asks for nothing beyond the download.
BasicATTCalc ships an update every 29 months, ClawOS every 10 days. The most recent releases landed on September 20, 2026 and September 28, 2026 respectively.
| Parameter | BasicATTCalc | ClawOS |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | — | 3.0 (24 ratings) — better |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | — | 24 — better |
| Update frequency | Every 29 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 14.5 — better | 18.0 |
| Further details — not scored | ||
| Size | 7 MB | 28 MB |
| Age rating | 4+ | 17+ |
| Developer | TAKAHIKO FUKUYAMA | Spark Limited Liability Company |
In-app purchases
BasicATTCalc
No in-app purchases
ClawOS
- ClawOS Monthly3 Days trial$29.991 Month
- 80 AI Credits$9.99
- 200 AI Credits$24.99
- 400 AI Credits$49.99
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- 1600 AI Credits$199.99









