Sigmakey vs Uniboard
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sigmakey
This utility provides a specialized keyboard for typing mathematical expressions, including fractions, roots, and Greek letters, directly within any app. It supports LaTeX, Unicode, and image output, with on-device processing for privacy and speed.
- Full math keyboard layout
- Two-dimensional cursor for exponents/numerators
- Type LaTeX, Unicode, or rendered image
- On-device typesetting, no network required
- Symbol search, recent, and favorite symbols
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Sigmakey is a math keyboard for people who need to type actual math, anywhere you can type at all. Fractions, exponents, roots, Greek letters, and matrices sit one tap away, and the cursor moves right into a numerator or an exponent, so scientific notation looks the way it should. - A full math keyboard layout that works in any app with a text field - A two-dimensional field with a cursor that steps into fractions and powers - Type LaTeX, plain Unicode, or a rendered image, whichever the app expects - Everything typeset on device, with no network - Search for a symbol, or grab a recent or a favorite Drop an equation into a note, a message, or a homework app without hunting through menus. Privacy Policy: https://docs.google.com/document/d/e/2PACX-1vTDX9pxPOlUJl_skVUHPi99mAw0y2B2BYd_v1mJkoF3xW3rlOcW5KlYd4t93MMbbGhctSTnBTy7d_l6/pub Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Uniboard
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Find Unicode characters, make the keyboard your own, and write Japanese or Mandarin Chinese using familiar letter keys. Uniboard combines exact character entry, personal symbol pages, font previews and downloadable language resources for iPhone and iPad. YOUR KEYS, YOUR ROWS Edit letter, number and symbol key actions, arrange keys in rows, and align rows left, center, right or with space between keys. Existing configurations keep their saved appearance until edited. The extra number row belongs to the letter section. When all ten digits are available there and the layout fits, the symbol sections combine into one page without discarding saved key choices. LANGUAGE CONVERSION Japanese romaji and Mandarin pinyin dictionaries are optional downloads, not bundled with the keyboard. In Languages, download only what you want, then enable each mode separately. Nothing downloads automatically. Conversion runs on your device. Choose converted text or tap your original spelling to insert it unchanged. While composing, Space confirms without adding a space, and Return confirms without submitting; press again for the normal action. Downloaded languages require Full Access so the keyboard can read language files shared by the app. This is local file access, not online typing. Direct Typing remains available without Full Access. Downloads require an internet connection. YOUR WORDS Add readings and preferred outputs in My Words, or preview and import a dictionary in Uniboard’s documented tab-separated text format. Imported dictionaries stay separate and can be enabled, disabled, exported or removed. Undo the last import without replacing your other dictionaries. Custom output preserves exact Unicode sequences, including emoji and combining accents. BROWSE AND INSPECT Search Unicode names, aliases, blocks or code points. Choose which emoji categories appear in the app and keyboard, including emoji search. Resize emoji in the app, and browse blocks from low to high or high to low code points. Hidden categories don’t remove saved favorites. Inspect the text visible in the keyboard preview: code points, names, normalization forms and UTF-8/UTF-16 values. Move the cursor within the text the typing app exposes. Inspection does not read the whole document, and available context depends on the app. FONTS AND IMAGES Compare font styles by weight and width. Download a single style where available, or a clearly labeled shared file containing several styles. Set preferred fonts for code points, ranges or blocks. These choices affect Uniboard’s rendering, not another app’s fonts. Copy visible preview text as an image with custom colors, transparency and resolution. Images paste as pictures where supported, not editable text. KEEP YOUR SETUP Export and import your configuration, or edit it in the app and validate before applying. Review replacements and resets, and undo the last configuration change. Language preferences and download references can be included, but dictionary and font files aren’t; missing downloads aren’t fetched automatically. Export custom dictionaries separately. Favorites and custom key text may be personal. No account, ads or analytics. Uniboard’s keyboard does not send your typing or custom words to a server. Enable Uniboard in iOS Settings under General > Keyboard > Keyboards. Some fields don’t allow custom keyboards. The interface and Unicode names are English. Font coverage, language resources and host-app behavior vary.
Screenshots
Verdict
The clearest difference is in-app purchases: Uniboard at none against Sigmakey's 1. Uniboard also leads on iOS requirement (17.0 vs 26.0). On price, ads and device support 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
Both are free to download. Sigmakey sells 1 one-off in-app purchase. Uniboard asks for nothing beyond the download.
| Parameter | Sigmakey | Uniboard |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | — | Every 3 days |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 13 MB | 49 MB |
| Age rating | 4+ | 12+ |
| Developer | Andrii Bashta | Kitta Co. |
In-app purchases
Sigmakey
- Sigmakey Pro$9.99
Uniboard
No in-app purchases









