English Phonemic Spelling
An orthography in which the correspondences between spelling and pronunciation are highly complex or inconsistent is called a deep orthography (or less formally, the language is said to have irregular spelling). An orthography with relatively simple and consistent correspondences is called shallow (and the language has regular spelling). —Wikipedia
The purpose of this project is to possibilitate respelling English text automatically with an alternate orthography devised to convey pronunciation unambiguously. Simply put, diacritics (accent marks) are appended to the letters of the words to make the orthography shallower without changing the letters themselves.

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Rules

Primary stress primary stress is marked by a macron (horizontal line) below the vowel of the stressed syllable.

Vowels reduced to mid central (marked in IPA as schwa ə), plentiful in English, are normally marked by a dot below, but when stressed, a vertical line below is used instead: otherwise otherwise. Depending on the dialect and particular word, these vowels may be realized differently, as /ʌ/ or even /ɜ/. However, in General American accent, no such distinction is present, so it is not (for now) honored within English Phonemic Spelling.

Silent letters are marked with an inverted breve (sad face curve) below or above: subtle, honest, though. As you can see, the only exception is the letter e, which is always silent on its own, and is only voiced when marked with an accent.

Consecutive letters of equal phonetic value are pronounced as if there was only one. That's why multiple vowel letters representing only one vowel sound all get diacritics, e.g. said, cough

Phonemes