Guesstimate vs HtmlFox
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Guesstimate
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Ever wonder "what's the answer if this number could be anywhere from 2 to 4?" Guesstimate is a calculator built for uncertainty. Use the ~ operator to define ranges in your formulas. For example, (2~4) * (1~3) means "a number between 2 and 4, multiplied by a number between 1 and 3." Guesstimate runs hundreds of thousands of Monte Carlo simulations to show you the full distribution of possible results. FEATURES - Uncertainty ranges: Use ~ to express "somewhere between" in any formula - Monte Carlo simulation: Up to 10 million iterations for accurate results - Interactive histogram: Tap bars to see exact percentages and sample counts - Box plot visualization: See min, Q1, median, Q3, and max at a glance - Full statistics: Mean, median, standard deviation, confidence intervals, and percentiles (P1 through P99) - Calculation history: Review and reload past formulas - Configurable settings: Adjust iteration count, histogram bins, confidence level, and distribution type (uniform or normal) - Built-in calculator keypad: No keyboard needed — dedicated buttons for digits, operators, parentheses, and the ~ range operator - Works on iPhone and iPad EXAMPLES - How much will dinner cost? (12~18) + (8~14) + (3~7) - Estimating project hours? (2~4) * (5~8) - Unit conversion with uncertainty? (2.79~3.09) * ((1300~1400) / (27~33)) No account required. No data collected. Just math.
HtmlFox
Edit and preview HTML files directly on your iPhone or iPad. Open local documents, modify source code, and export your work as HTML or PDF. This tool offers instant previews and efficient file management for web developers and hobbyists.
- Edit HTML source code
- Preview local HTML files
- Export as HTML
- Export previews as PDF
- Search page content
- Access recent documents
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HtmlFox is a lightweight HTML document editor and preview tool for iPhone and iPad. Open local .html, .htm, and .xhtml files from the Files app, preview them instantly, search page content, edit source code, and export your work as HTML or PDF. Key features: • Open local HTML and XHTML documents • Preview pages in a clean reading view • Search within page content • Edit HTML source code • Export edited documents as HTML • Export previews as PDF • Reopen recent documents quickly • Distinguish same-name files by source path • Works without an account HtmlFox is designed for local documents. Your files and recent file information stay on your device and are not uploaded to the developer. Editing and export are available with HtmlFox Pro, a one-time in-app purchase with no subscription. The app includes local introductory access so you can try Pro features before unlocking.
Screenshots
Verdict
The clearest difference is price: HtmlFox at Free against Guesstimate's $2.99. Guesstimate's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement 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
HtmlFox is free to download; Guesstimate costs $2.99 up front. HtmlFox sells 1 one-off in-app purchase. Guesstimate asks for nothing beyond the download.
| Parameter | Guesstimate | HtmlFox |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 3 days | — |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.6 | 17.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | mark cotton | 旭 罗 |
In-app purchases
Guesstimate
No in-app purchases
HtmlFox
- HtmlFox Pro$2.99









