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Anachronism checker for period writing.
Paste up to 1,500 words of a novel or screenplay set in the past. Storskarvia's fact-checker finds the details that could not exist yet, and shows you the evidence and the source for each one.
The AI writes no prose. You get findings, never rewrites.
Check a passage
It was the second week of June, 1962, and the kitchen was hot by eight. Nan folded the two pages twice, creased them with her thumbnail, and got them into the envelope before she could read them over and lose her nerve. She wrote the zip code from memory, the way you do with a street you have known since you were small. Then the stamp, eight cents, pressed down harder than it needed to be. Mrs. Vance had her radio in the window again. "Please Please Me" for the third time before nine, and the sound came down the drive after Nan like something she had forgotten to put away. She walked to the box at the end of the road with the envelope held out from her side, the way you carry something you have decided not to think about. A plane went over low on its way out of Idlewild, one of the new 727s, and she stopped in the gravel to watch it the way she still stopped for planes. Her mother had done that. It was the one thing of her mother's she had not managed to put down. The walk back took longer. It always did. By the time she reached the porch the heat had come up off the road and the morning had that flat white look it got before noon, and her father was awake and wanting his coffee and the television on for The Fugitive, and she would sit through it beside him the way she had sat through the last four years, waiting for something in the room to change. June 1962, outside New YorkFindings only.
A card with the quote, the problem, the evidence and a source, or one line saying nothing was found.
Evidence you can follow
Each claim is checked against Wikipedia and independent web sources. Every card links the source, and wears a confidence score that only climbs when two independent sources agree.
Every flag faces the Skeptic
Before a finding reaches you, a second pass argues against it with the same evidence. Findings that do not survive are dropped.
It never writes for you
Storskarvia never writes a word for you. The checker has no way to suggest prose. It tells you what is wrong and where, and the fix stays in your hands.
Questions
What does the anachronism checker look for?
Real-world details that could not exist when your scene is set: products, prices, technology, songs, films and shows, laws, place names and events that arrive too late for the date on the page. It also reports plain factual errors it meets along the way, such as a wrong date or a misattributed line.
What will it miss?
Anything it does not recognise as a checkable claim. Slang and idiom that sound too modern, attitudes, and details your passage never ties to a date are the usual gaps. It reads one passage at a time, so it cannot see a year you set three chapters earlier unless you type it in the setting box. It cannot judge invented worlds, alternate history or a deliberate anachronism, and it will sometimes be wrong. Treat each card as a lead to verify, which is why every card shows its evidence and a source link.
How does it work?
It is a large language model working from sources. It reads your passage and lists the real-world claims it makes, searches Wikipedia and the web for evidence on each one, and judges each claim against what it found. Every problem it wants to report then goes to a second pass, the Skeptic, which argues against it using the same evidence. Only findings that survive reach you, each with the quote, the problem, the evidence and a source.
Does the AI rewrite my passage?
No. Storskarvia never writes a word for you. The checker writes no prose and suggests no rewrites. It returns findings, and every fix stays yours.
Do you keep my text or train on it?
Storskarvia does not store your passage. It is held in memory only while the check runs and is never written to our database. The findings, which quote the lines they flag, are kept for 24 hours so you can reload the results page, then deleted. Storskarvia never trains anything on your writing. The model that reads your passage is DeepSeek's, reached through its API, and short search queries built from the passage go to Wikipedia and web search services. DeepSeek's terms make no promise not to train on what it receives through its API, so do not paste anything you would not send there. Our privacy policy at storskarvia.com/privacy has the details.
I write science fiction or fantasy. Anything I should know?
Yes, if you are aiming at a Nebula. SFWA's Nebula Awards rules (rule 9.11) make works written wholly or partly by large language models ineligible, and say that works which used LLMs at any point during the writing process must disclose it and will be disqualified. This checker writes no prose, but it is an LLM tool reading your draft, and SFWA has not said whether a fact check counts. If a Nebula matters to you, read the current rules and ask SFWA before running this on eligible work.
How much can I check?
Up to 1,500 words at a time and three checks a day, free, with no account. A free Storskarvia account checks whole chapters and manuscripts, remembers the year you set in chapter one, and adds a continuity editor.
Read the privacy policy, see how the fact-checking works, or read the guide to avoiding anachronisms in period writing.
Every writer deserves a staff
A free account checks whole chapters and manuscripts, remembers the year you set in chapter one, and adds a continuity editor.