Behind one line, "Cosine theorem, baby": a Turkish publisher spends big selling a $870 university-exam prep pack

Why ÜçDörtBeş All Star (ucdortbesallstar.com) got this far

Research date 2026-11-07. Data comes from our traffic / googleplay / appstore databases and public web pages; sources are attached to each section.

One line

Turkey's leading exam-prep publisher ÜçDörtBeş (345 Yayınları) launched a premium all-in-one prep product in August 2024: a "print bundle + app video lessons / homework / mock exams" package (YKS university entrance, with LGS middle-school exam added in 2025). The official site is both the storefront and the login portal. Its climb up the rankings comes mainly from three things stacked together: the 8–September school-start prep season, a Seda Sayan TV/social ad that went live in Aug 21, and a mass-recruitment playbook that signed nearly every YouTube teacher and entertainment creator in Turkey. It's a B2C/B2B education product driven by publisher brand, money and celebrities, not a lightweight indie product.

What it is

• The operating entity is Allstar Akademi Eğitim Yayıncılık ve Dağıtım A.Ş., parent brand ÜçDörtBeş Yayınları. 345's question bank and mock exams have a strong reputation in Turkey's YKS circles; on ekşi sözlük someone says it "ranks first among the best-selling YKS books" (ekşi: üç dört beş yayınları).
• Product (official site 2026-11-07): the YKS 2027 bundle has 31 explanation books + 31 workbooks ("veri bankası"), 8000+ pages in total; plus 30k+ videos from 60+ teachers. Features include smart homework assignment, mock exams, "loss-of-points analysis," the "Baykuş mentor," error-question frequency, and a photo-solve app.
• Price: the science bundle is ₺37,500 (about $870), payable in 9 interest-free installments, with a 12-installment option too. In 2024 August, a Reddit post put the price at 26,000 TL, discounted to 22,000 TL (r/liseliler).
• No-questions-asked refund design: 15-day full refund, as long as no more than 10 books have been used. There's also Kurumlara Özel, an institutional version sold to cram schools (dershane) and schools (LinkedIn has a series of "All Star'lı kurumlar" posts).
• The tech foundation is codexservice.com (Android package com.codex.ucdortbesallstar). The web version is at app.ucdortbesallstar.com.
• Where the traffic lands: Study happens mainly in the app (Google Play 594k installs, iOS TR 2,970 ratings). The website handles the landing page, purchases, "Tanıtım İste" (book a demo), and web-based studying. The rise in Tranco and CrUX reflects landing page and web login traffic during buying season.

Data

Peer comparison (to show how much of this wave is industry seasonality):

• Tonguç Akademi: Tranco 10-07 465,764 → 11-05 222,292, also doubled.
• Kunduz: 194K → 136K.
• Raunt: 717K → 553K; CrUX Turkey in September also rose from before 50k to before 10k.
• Doping Hafıza: CrUX global rose from before 500k to before 100k in August.

The whole Turkish exam-prep sector peaks every year from 8 to November: YKS is taken in June, results come out in July, school starts in September, and new candidates buy books now. What sets ÜçDörtBeş All Star apart from the rest is that it has grown much more: its CrUX in Turkey jumped from the 50k tier to the 5 thousand tier, placing it alongside long-established digital platforms like Doping Hafıza, Tonguç, and Kunduz. The parent brand's site, ucdortbes.com, has been stuck in the 50k tier for five months (traffic.crux_domain). So this isn't just seasonality; in two years, this product line grew into a platform of the same scale as the leaders.

Why it took off

1. The parent brand's trust and channels were already in place. 345's question banks and mock exams were already common YKS workbooks with a good reputation. All Star packaged that trust as a "complete system" and gained ready-made access to bookstores, cram schools, and schools. The institutional version shows it is pursuing B2B2C: bulk purchases by cram schools, with students using the app.
2. Locking in whole roster of internet teachers. A former candidate on ekşi listed a roster: math's Mustafa Yağcı, Şenol Hoca, Rehber Matematik, and Bıyıklı Matematik; chemistry's Görkem Şahin and Celal Hoca; physics' Özcan Aykın, Fizik Finito, and VIP Fizik; biology's Dr. Biyoloji and Biosem; and so on. Most of Turkey's top YouTube teachers are on All Star. The post's wording was that it had "signed up nearly every teacher in the YKS industry" (ekşi: üçdörtbeş all star). Each teacher has their own followers, so their videos became a distribution channel.
3. Large-scale celebrity and entertainment influencer ad spending.
   • Galatasaray footballer Victor Osimhen appeared in an ad; that YouTube video has 210k views (YouTube).
   • 2026-08-21 launched an ad film with Seda Sayan. Its line "Kosinüs teoremi bebeğim" flooded social media and sparked controversy. The agency was Rafineri and the production company was DCC Film (Marketing Türkiye). The timing lines up with the acceleration in Tranco starting in August.
   • ekşi users also named: film critic YouTuber Murat Soner, rapper Ebo, Melih Abuaf, Fırat Sobutay, comedy creator Oğuzhan Alpdoğan, Akademik Link, "they even signed ESG"; plus Toprak and Semih. In 2025 there was also Kemal Can Parlak's comedy sketches.
   • One user complained that "the later positive reviews look like ads written with a thousandth of the money they paid Osimhen" (ekşi entry), suggesting paid or seeded positive reviews.
4. Using top scorers and rankings as testimonials. After the 2026 July YKS results, it promptly invited YKS 2026 science track national #1 Şerif Efe Dartar to its office for an unboxing and a review of the system, with the content posted on YouTube, TikTok, Facebook, and IG. TYT national #1 Miraç Koşar was also used in promotion, along with posts like "ranked #79 and studied with All Star." The homepage features "Başarı Hikayelerini İzle" (watch success stories).
5. Event-style marketing plus KOL experience vlogs. In 2024 it held a launch event with many celebrity teachers and influencers; influencer Ecre Ay's event vlog has 27k views (search summary). There are also many candidate-made reviews, such as DuruÜst's "is it worth it after 1 months" with 43K views, and long threads on tech forums.
6. Lowering the high-price barrier with refund guarantees and installments. A 15-day no-questions-asked refund plus 9–12 interest-free installments, together with November discounts, split a one-time spend of several hundred dollars into roughly ₺4,167 per month.
7. Buy once a year, with the product line expanding. The sets are sold by exam year (2026, 2027, ...), so every new cohort of candidates has to buy again. 2025-12 added the AYT set, and in 2025–26 years added the LGS line. LGS has its own YouTube channel, and by 2026-08-19 people were already buying the LGS 2027 set on the website (Şikayetvar). There are also short-cycle products like "finish YKS in 24 weeks" and the "TYT sprint camp."

Growth tactics (evidence)

Competitors

Differentiation

Its edge is "345 publisher's paper-book system × industry-wide web-famous teachers × app data loop" packaged as a pricey annual bundle. Rivals have only one or two of these: Raunt has bundles but no star teachers, Doping has digital courses but no print brand, and teachers each go it alone. That edge is not the direct reason for its ranking climb this time. Knowledgeable users on ekşi generally feel the product itself has nothing new; it's just "open the book, watch the video," with weak AI and personalization. What pushed it into the top tier over two years is the parent brand's trust, locking up teacher supply, and buying ads with celebrities, plus the exam-prep peak every year from 8 to November.

How many people have seen it

• Already a mass-market brand in Turkey: it ran TV ads, was covered by marketing trade media, and is widely discussed on ekşi, Şikayetvar, Reddit and tech forums (praise and criticism both).
• Revenue is not public, and almost nobody in the English-speaking world or tech/indie-dev circles talks about it (x-radar shows no related tweets in the last 90 days).
• For us, it's a fight among the local market's top players over resources, not an undiscovered gap.

What others can borrow

• In exam-driven smaller-language markets (India, Indonesia, Egypt, Vietnam, Brazil), combine a paper-workbook publisher's brand and channels with signing a group of web-famous teachers, sell it as a pricey year-by-year bundle, and lower the decision barrier with a "no-questions refund + interest-free installments."
• Sign top scorers as testimonials right after results are released, and use celebrity ads before the peak season to ignite demand.
• B2B: sell to cram schools and let them distribute it for you.
• Prerequisites: you need publisher or famous-teacher resources, and you must be able to afford heavy printing and ad spending. What an indie developer can borrow mainly are the moves of "bring teachers in as partners + outcome testimonials + refund guarantees."

Unknowns

• How many bundles actually sold and how much revenue came in are unknown. How many of the Play installs (about 600K) are paying users versus accounts batch-opened by tutoring centers or demo accounts is unclear.
• The budget size for celebrity and influencer ads is unknown, and we can't confirm how much of this ranking rise came from Seda Sayan's ads versus seasonality. Peers had similar rises during 10–November.
• Whether it runs Meta / Google performance ads isn't covered in our database.
• The equity relationship between the parent brand and Allstar Akademi, and whether there's outside investment behind them, is unverified.
• Reputation risk: Şikayetvar has complaints of slow shipping and accounts still showing demo versions after payment; on ekşi, people question content quality and fake reviews.