Google Sheets to Gmail, weekly tech stack digests
Tech stacks change quietly. A competitor adds a new analytics tool, swaps a chat widget, or moves email providers, and you only notice weeks later after you’ve already made decisions on old information.
This is where Sheets Gmail digest automation pays off. Marketing leads need faster competitive notes for positioning, agency owners want cleaner client updates, and product teams hate chasing screenshots across ten tabs.
This workflow pulls the companies you track in Google Sheets, checks their technology stack via an API, summarizes the meaningful changes with AI, then emails a weekly digest through Gmail. You’ll see what changed, why it matters, and what to do next.
How This Automation Works
See how this solves the problem:
n8n Workflow Template: Google Sheets to Gmail, weekly tech stack digests
flowchart LR
subgraph sg0["Weekly Flow"]
direction LR
n0["<div style='background:#f5f5f5;padding:10px;border-radius:8px;display:inline-block;border:1px solid #e0e0e0'><img src='https://flowpast.com/wp-content/uploads/n8n-workflow-icons/code.svg' width='40' height='40' /></div><br/>Extract Tech Stack Info"]
n1@{ icon: "mdi:brain", form: "rounded", label: "OpenAI Chat Model", pos: "b", h: 48 }
n2@{ icon: "mdi:play-circle", form: "rounded", label: "Weekly Trigger", pos: "b", h: 48 }
n3@{ icon: "mdi:database", form: "rounded", label: "Fetch Domain List", pos: "b", h: 48 }
n4["<div style='background:#f5f5f5;padding:10px;border-radius:8px;display:inline-block;border:1px solid #e0e0e0'><img src='https://flowpast.com/wp-content/uploads/n8n-workflow-icons/httprequest.dark.svg' width='40' height='40' /></div><br/>Get Tech Stack (BuiltWith API)"]
n5@{ icon: "mdi:robot", form: "rounded", label: "Generate Stack Summary (AI)", pos: "b", h: 48 }
n6@{ icon: "mdi:message-outline", form: "rounded", label: "Send Summary Email", pos: "b", h: 48 }
n2 --> n3
n3 --> n4
n1 -.-> n5
n0 --> n5
n5 --> n6
n4 --> n0
end
%% Styling
classDef trigger fill:#e8f5e9,stroke:#388e3c,stroke-width:2px
classDef ai fill:#e3f2fd,stroke:#1976d2,stroke-width:2px
classDef aiModel fill:#e8eaf6,stroke:#3f51b5,stroke-width:2px
classDef decision fill:#fff8e1,stroke:#f9a825,stroke-width:2px
classDef database fill:#fce4ec,stroke:#c2185b,stroke-width:2px
classDef api fill:#fff3e0,stroke:#e65100,stroke-width:2px
classDef code fill:#f3e5f5,stroke:#7b1fa2,stroke-width:2px
classDef disabled stroke-dasharray: 5 5,opacity: 0.5
class n2 trigger
class n5 ai
class n1 aiModel
class n3 database
class n4 api
class n0 code
classDef customIcon fill:none,stroke:none
class n0,n4 customIcon
The Challenge: Tracking competitor tech stack changes without living in tabs
If you’re tracking competitors, you already know the annoying part isn’t finding tools once. It’s noticing the change. Somebody adds a new A/B testing platform, removes a live chat widget, or suddenly starts running a different tag manager. You can try to “check occasionally,” but that turns into a half-broken routine: a few manual lookups, some notes in a doc, and then silence until the next panic. Meanwhile, your team is making messaging decisions, outbound lists, and partnership assumptions on stale inputs.
It adds up fast. Here’s where it breaks down.
- You end up copying stack details into spreadsheets by hand, and small errors make the whole sheet unreliable.
- Important swaps get buried because updates come in random bursts, not on a cadence your team can actually use.
- “We should monitor this” becomes a recurring meeting note, not an operational system.
- When someone asks “what changed this week?”, you’re stuck re-checking sites instead of answering.
The Fix: A weekly Google Sheets → Gmail tech stack digest powered by AI
This workflow turns your competitor list into a dependable weekly report. It starts on a schedule (once a week), reads the domains you track from Google Sheets, then calls a tech-stack data source (like BuiltWith via HTTP request) for each company. After the raw response comes back, the workflow parses the details in code so it can isolate what matters: new tech adoptions, removals, and patterns across your list. Then an AI agent uses an OpenAI chat model to write a human-readable digest, including trend notes and practical takeaways. Finally, Gmail sends the summary to you (or a shared inbox) so it lands where your team already checks updates.
The workflow starts with a weekly kickoff. From there, it fetches your tracking list in Google Sheets, queries the tech stack API, and cleans the data into a consistent format. AI then converts “noisy tool data” into a structured digest, and Gmail delivers it automatically.
What Changes: Before vs. After
| What This Eliminates | Impact You’ll See |
|---|---|
|
|
Real-World Impact
Say you track 25 competitor domains. Manually, even a quick check can take about 5 minutes per company (open tool, search domain, scan, note changes), which is roughly 2 hours each week. With this workflow, the “work” is basically zero: the schedule triggers automatically, the API calls run in the background, and you just read the Gmail digest in a few minutes. You’re not guessing anymore, and you’re not spending Monday morning doing detective work.
Requirements
- n8n instance (try n8n Cloud free)
- Self-hosting option if you prefer (Hostinger works well)
- Google Sheets to store your tracked domains list
- Gmail to deliver the weekly digest to your inbox
- BuiltWith API key (get it from your BuiltWith account dashboard)
Skill level: Intermediate. You’ll connect accounts, add an API key, and be comfortable adjusting a prompt and one small parsing step if your API response differs.
Need help implementing this? Talk to an automation expert (free 15-minute consultation).
The Workflow Flow
Weekly kickoff schedule. The automation runs on a weekly timer, so you’re not relying on someone to remember to “do competitive research.”
Domain list pulled from Google Sheets. n8n reads your sheet of tracked companies (usually one domain per row) and prepares each one for lookup.
Tech stack lookup via HTTP request. For every domain, the workflow calls your tech stack API (like BuiltWith), then a parsing step cleans and standardizes the response so it’s usable.
AI summary and Gmail delivery. An AI agent drafts the digest using an OpenAI chat model, then Gmail sends a single clean email that highlights changes, trends, and next actions.
You can easily modify the domains source to come from Excel 365 instead of Google Sheets, or route the final digest to multiple recipients based on your needs. See the full implementation guide below for customization options.
Step-by-Step Implementation Guide
Step 1: Configure the Schedule Trigger
Set the weekly schedule that starts the workflow.
- Add and open Scheduled Weekly Kickoff.
- Set the weekly rule to run on Monday at 09:00 (as configured in the node).
Step 2: Connect Google Sheets
Pull the domain list from your sheet to drive API lookups.
- Open Retrieve Domain Sheet and select the spreadsheet.
- Set Document to
[YOUR_ID]. - Set Sheet Name to
Sheet1(gid0). - Credential Required: Connect your googleSheetsOAuth2Api credentials.
Step 3: Set Up the API Call and Parsing
Query BuiltWith for each domain, then extract the first detected technology from the response.
- Open Request Tech Stack API and set URL to
https://api.builtwith.com/v21/api.json. - Enable Send Query and add query parameters: KEY =
[CONFIGURE_YOUR_API_KEY]and LOOKUP ={{ $json['Domain '] }}. - Open Parse Stack Details and keep the provided JavaScript that extracts Technology, Category, First Detected, Last Detected, Domain, and URL.
Domain (with a trailing space). Make sure your Google Sheet header matches this exactly or update the expression in Request Tech Stack API.Step 4: Set Up the AI Summary
Generate a human-readable summary from the parsed tech stack data.
- Open Compose Stack Summary and set Text to:
=Provide summary of the data that is scraped from BuiltWith Domain: {{ $json.Domain }} Technology: {{ $json.Technology }} Category: {{ $json.Category }} First Detected: {{ $json['First Detected'] }} Last Detected: {{ $json['Last Detected'] }} URL: {{ $json.URL }}- Ensure OpenAI Chat Engine is connected as the language model for Compose Stack Summary.
- Credential Required: Connect your openAiApi credentials in OpenAI Chat Engine (AI sub-node credentials are set on the model node, not the agent).
- Set the model in OpenAI Chat Engine to
gpt-4o-mini.
Step 5: Configure the Email Output
Send the AI-generated summary via Gmail.
- Open Dispatch Summary Email.
- Set Send To to
[YOUR_EMAIL]. - Set Subject to
Weekly BuitlWith Ecommerce Platform Summary. - Set Message to
{{ $json.output }}. - Set Email Type to
text. - Credential Required: Connect your gmailOAuth2 credentials.
Step 6: Test and Activate Your Workflow
Validate the flow end-to-end, then enable it for weekly execution.
- Click Execute Workflow to run a manual test.
- Confirm Retrieve Domain Sheet outputs a row with a
Domainvalue. - Verify Request Tech Stack API returns a response and Parse Stack Details outputs a single extracted item.
- Check Compose Stack Summary returns an
outputfield, and Dispatch Summary Email sends an email to[YOUR_EMAIL]. - Toggle the workflow Active to enable weekly runs from Scheduled Weekly Kickoff.
Watch Out For
- Google Sheets credentials can expire or need specific permissions. If things break, check the n8n Credentials page and the sheet’s sharing settings first.
- If you’re using Wait nodes or external rendering, processing times vary. Bump up the wait duration if downstream nodes fail on empty responses.
- Default prompts in AI nodes are generic. Add your brand voice early or you’ll be editing outputs forever.
Common Questions
About 15 minutes if your accounts and API key are ready.
Yes. No coding is required, but someone should be comfortable pasting an API key and testing the first run. If the API response format differs, light tweaking may help.
Yes. n8n has a free self-hosted option and a free trial on n8n Cloud. Cloud plans start at $20/month for higher volume. You’ll also need to factor in OpenAI API usage and your BuiltWith API plan.
Two options: n8n Cloud (managed, easiest setup) or self-hosting on a VPS. For self-hosting, Hostinger VPS is affordable and handles n8n well. Self-hosting gives you unlimited executions but requires basic server management.
You can swap the data source by replacing the “Retrieve Domain Sheet” Google Sheets step with Excel 365, or even a webhook if you want to push domains in from another tool. Most teams also customize the AI agent prompt in “Compose Stack Summary” to match their industry and what counts as a “significant” change. If you only care about certain categories (analytics, CRM, chat), filter the parsed stack output before the summary is written.
Usually it’s expired Google authorization or the sheet is in the wrong Google account. Reconnect the Google Sheets credential in n8n, then confirm the spreadsheet is shared with that account. Also double-check the Sheet ID and tab name, because a renamed tab will break lookups.
For most small lists (like 10–100 domains), it runs comfortably on a basic n8n setup.
Often, yes, especially once you want real parsing and a smarter summary. This workflow leans on an HTTP request, a code-based parsing step, and an AI agent prompt that you will tweak over time, and n8n handles that kind of logic cleanly without turning every branch into a new paid task. Zapier or Make can still work for a simpler version, but you may hit limits when you want to loop through domains, merge results, and control formatting. The other big factor is cost: self-hosting n8n can keep execution volume from becoming a surprise bill. If you’re unsure, run the workflow on a small list first and compare the maintenance effort. Talk to an automation expert and we’ll help you pick the right approach.
Once this is running, your weekly competitive tech stack update becomes an email you can forward with confidence. The workflow handles the repetitive checking, and you get to focus on the moves that actually matter.
Need Help Setting This Up?
Our automation experts can build and customize this workflow for your specific needs. Free 15-minute consultation—no commitment required.
