I built a crowdsourced deals + map app for Vietnam in 6 months — stack, traffic, and what broke
A developer created a crowdsourced map app for cheap dining and shopping in Vietnam within six months. The app, cheap-map.app, allows users to submit prices and aggregates deals from various merchants. The developer shared insights on the technology stack used and challenges faced during the build process.
- ▪The app aims to help locals and tourists find affordable food and shopping options in Vietnam.
- ▪The technology stack was chosen to keep operational costs under $30 per month at 1,000 users per day.
- ▪The developer encountered issues with Vercel's ISR Writes, which were resolved by adjusting caching settings.
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Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/daohieu91/i-built-a-crowdsourced-deals-map-app-for-vietnam-in-6-months-stack-traffic-and-what-broke-5ac7 |
| Publication time | Fri, 22 May 2026 05:49:54 +0000 |
| Retrieval time | 2026-05-22T06:02:00.658Z |
| Last seen | 2026-05-22T06:02:00.658Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | zzuo4EBJw2HY |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3945316) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } daohieu91 Posted on May 22 I built a crowdsourced deals + map app for Vietnam in 6 months — stack, traffic, and what broke #showdev #webdev #nextjs #java 22 days ago I shipped cheap-map.app — a crowdsourced map of cheap restaurants, shops, and gas stations across Vietnam, with a multi-merchant affiliate deals aggregator bolted on. ~50 organic users a day now, hockey-stick just starting.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at DEV.to (Top).
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