An AI Saju App Sells Its Memory. Its Worst Reviews Are About That, Too

Sajuping, a Korean AI app for saju (the Korean name for Four Pillars, or BaZi, birth-chart fortune-telling), calls itself on the App Store "the AI saju friend who remembers me." Its FAQ makes that the main selling point: ordinary saju sites show a chart and some prewritten fortunes, while Sajuping puts a chatbot on top of the chart calculation that keeps track of your situation, so you never have to re-explain your birth date and backstory. On Oct. 6 it shipped version 2.1.106, and one line in the release notes reads like a confession: bring up a friend or family member, and it will no longer get confused about who you mean.

Users had been complaining about exactly that for months. On Aug. 19 a long-time user wrote that the app used to remember which day pillar the other person had, but lately forgot it and called them by a different one, so they had to spend another "ping" to correct it. Pings are the app's question credits; a free one refills every 24 hours, and the rest are bought. On Aug. 16 someone said that after switching to a different birth chart, the app kept drawing on conversations about the old one. A one-star review on Aug. 13 said it kept answering from past chats and had to be corrected every time, and advised against paying. On July 7 a user reported something stranger: after deleting every conversation and starting fresh, the app still referred to what had been deleted.

The upside of memory shows up just as concretely. A Sept. 17 reviewer who had tried reading saju through ChatGPT said the best part was not having to explain things again, because the app tied their earlier situation into new answers. Another said you enter your chart once and it handles the rest. And there are the uncanny moments people love to report: on July 30, a user who had just broken up asked when their ex would get in touch; the app named three dates, and a message arrived on one of them.

Memory only helps if the chart is right. Several bad reviews are about the calculation itself: on Sept. 22, someone said it labeled a ten-year luck cycle with the wrong ten-god; in March, a user listed their birth details and said the app's day pillar was off by a day; in August, another had to argue through five rounds before the app admitted a calculation mistake. An app that remembers a wrong chart carries the error into every answer after it.

A separate complaint has nothing to do with memory: the answers themselves changed. A Sept. 22 review said replies had become superficial. The developer responded on Sept. 28 that recent adjustments to how it answers had disappointed users and that it had already fixed them. Three more reviews followed on Oct. 1 and 2: a stiffer tone, answers too short that kept calling things "neutral," and replies generic enough to fit anyone. The Oct. 1 update had renamed the app's answer styles Route, Atlas and Zenith without saying what changed underneath.

Free and paid answers aren't meant to be equal anyway. The FAQ says both use the same chart calculation, but paid pings run on a higher-performance AI model and give more detailed, more accurate, longer answers; free pings are fine for daily check-ins, paid ones for job or relationship decisions. The same FAQ says general chatbots give a different answer every time, while Sajuping remembers context and stays consistent. Its terms, revised Sept. 4, say the AI may produce different results for the same question and that the company does not guarantee accuracy or consistency.

Competitors are heading the same way. Jamo, another Korean AI saju app, added a deeper conversation mode for its Premium+ tier on Oct. 3 and a shared daily fortune for family and friends in September. One Jamo user wrote on Sept. 4 that after an update it forgot their chart and contradicted itself, and wished it would simply keep their parents' and partner's charts on file. Another, on Sept. 15, had already paid 59,000 won (about $42) for a year of Premium and was now being asked to buy Premium+ on top. In China, Wentian AI's Oct. 2 update launched Wentian Claw, which chats over WeChat and WhatsApp using your chart plus personal memories you authorize, along with a screen for managing those memories.

So is a fortune-telling bot that remembers you worth using? The memory is genuinely useful: ask about the same situation over several days and it keeps the thread, without you retyping your birth details and backstory. But the reviews show its most common failures come from that same memory: mixing up people, clinging to an old chart, recalling what you deleted. Check the four pillars it calculates against a standard calendar before trusting anything else, confirm whose day pillar it is using before spending paid credits on someone else, and keep one person per chat. If free answers feel thin, remember they come from the cheaper model; pay once to see the better one before committing to a year.