Comprehensive and elegant subject indexes in under 60 minutes. Export directly to publication-ready formats. No editing required.
Learn MoreHigh-accuracy scripture indices within minutes, not days. Export directly to publication-ready formats.
Learn MoreOur tools are built first for the highest standards of accuracy. Our systems outperform other AI indexing systems in addition to being of equal or superior quality to human professionals.
What used to take days to weeks of manual labor now takes minutes to hours. Cut publishing timelines and headaches without increasing overhead.
We run all our AI systems on our private servers in Nuremberg, Germany. We do not send your data to any third party AI providers. We automatically delete all uploaded documents from our servers after 24 hours, and never use them for improving or training our systems.
We charge 10-20x less than our human counterparts while producing equal or higher quality indexes. Compare our fixed rate of $0.50/page to $5-10/page.
Control exactly how many entries or index pages are generated, with granular settings for term selection, entry density, subentry depth, and cross-reference rules.
March 1, 2026
We trained an AI on 1,000+ publicly available back-of-the-book indexes. The resulting model, IndexLM-1, consistently outperforms general-purpose LLMs on subject indexing.
February 3, 2026
Scripture indexing is deceptively simple until you encounter the real-world complexities of semantic context.
January 10, 2026
IndexerLabs launched ScriptureBench and ScriptureLM-1 to benchmark and improve scripture indexing accuracy.
Yes, IndexerLabs employs the use of custom-trained Artificial Intelligence (AI) models to automate the process of indexing. We've custom-trained an AI model on 1,000 real-world indexes, which significantly improves accuracy and indexing taste. Read more about this model, IndexLM-1, in our blog post.
Yes, and significantly more so than other AI products. We host all our models on our own servers, so third parties never get your data. We do not send your data to any third parties like OpenAI or Google. We permanently and automatically delete all uploaded documents from our servers after 24 hours, and never use them for improving or training our product under any circumstances.
Two answers:
1. For subject indexing, the short answer is: yes, the quality of the indexes that we produce are measurably equivalent to their human counterparts. The longer answer is that even between two highly skilled and experienced human indexers, there can be a fairly wide (up to 50% and higher) variation in structure and term selection for any given index. The nature of subject indexing is such that it is difficult to measure the exact "accuracy" of an index (aside from the matter of ensuring page locators are accurate). However, there typically should be a substantial overlap in coverage of significant terms and core themes within a given manuscript, under the same page constraint. Our SubjectBench evaluation test sets measure the accuracy and usefulness of our generated indexes against their human counterparts, for books not included in their training dataset.
2. For scripture indexing, our systems score at an average of 98-99% accuracy on our ScriptureBench evaluation test sets when compared against existing human indexes. You can read more about our results here.
You can view a short demo on our subject demo page!
We'll continue to add more demos to the collection.
We offer full refunds within 7 days of purchase.
To request a refund, please contact us at support@indexerlabs.com.
For more details consult our legal page.
We charge a flat $0.50 per page, regardless of document content. This is around 10-20x cheaper than traditional indexing.
Yes. While we aim to produce an elegant, high-quality index that adheres to your specifications on the first attempt, we allow for manual and AI-powered editing if there's anything you want to change, free of charge.
You can export your index into Microsoft Word (.docx), PDF (.pdf), plain text (.txt), or CDFX/IXML (used by professional indexing tools like Cindex).
Additionally, if you need any specific output formats tailored to your publisher's specifications, feel free to email us at support@indexerlabs.com at any time and we can help make a custom output format at no extra charge.
For support, questions, or feedback, please email us at support@indexerlabs.com. We typically respond within 48 hours.
After you upload a document, Subject Indexing usually takes 1-3 hours, depending on the length and complexity. In many cases, a 300-page book can be processed in under an hour.
Scripture Indexing usually finishes within 30 minutes of upload.